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3-1 Regenerators 35 The weight of the single units can reach values up to 60 tonne, and larger weights can be achieved if several units are joined together. It is possible then to adapt the PCHE to a wide range of operating conditions. Though the maximum pressure is 650 bar, the maximum value in practice will depend on the working temperature as well, as shown in the operational envelope of Figure 3-2. The effectiveness of this type of heat exchangers is very high and experimental results have reported values close to 99% [53], which is much higher than the standard values for industrial gas turbine regenerators (90% [54]). 3-1-2 Material and geometrical characteristics Song [4] investigates the performance of a PCHE for supercritical CO2 applications and he obtains the internal geometry of heat exchanger. A schematic diagram of the PCHE section and a single channel are shown in Figure 3-3. (a) PCHE cross section. (b) Channel top view. Figure 3-3: Geometry of the section the core of a PCHE and top view of a single channel. The design specifications from the manufacturer and the results of the calculations per- formed by Song are presented in Table 3-1. Notice that the travel length and the angles of the hot and cold sides are different due to the different number of channels. The density of the heat exchanger is close to that of steel itself (7990 kg/m3 [55]) since it is almost a steel solid Table 3-1: PCHE design specifications used in the work of Song [4] Characteristic Design pressure Design temperature Flow area Number of channels Hydraulic diameter Heat transfer area Mass Dimensions Material Values calculated by Song Channel diameter Travel length Wave angle (θ) Plate thickness (δ) Plenum length Density Hot side bar 83 ◦C 200 mm2 1047 1176 mm 0.92 m2 5.6 kg 203 mm 120x200x1200 SS 316 mm 1.51 m 1.230 ◦ 20.31 mm 1.76 mm 49 kg/m3 7048.6 Cold side 216 200 930 1050 0.92 5.6 SS 316 1.51 1.378 33.36 1.76 46.5 Master of Science Thesis J.S. Bahamonde NoriegaPDF Image | Design method for s-CO2 gas turbine power plants
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